test/torturethread.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 07 Dec 2017 16:08:09 -0800
changeset 11730 ac6c607e065c
parent 10737 3406a0f8b041
child 11811 5d94cb6b24d3
permissions -rw-r--r--
Enable building the Metal renderer by default, and weak link the Metal framework so the SDL library is safe to use on older Macs
Also generate iOS versions of the Metal shaders
     1 /*
     2   Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
     3 
     4   This software is provided 'as-is', without any express or implied
     5   warranty.  In no event will the authors be held liable for any damages
     6   arising from the use of this software.
     7 
     8   Permission is granted to anyone to use this software for any purpose,
     9   including commercial applications, and to alter it and redistribute it
    10   freely.
    11 */
    12 
    13 /* Simple test of the SDL threading code */
    14 
    15 #include <stdio.h>
    16 #include <stdlib.h>
    17 #include <signal.h>
    18 #include <string.h>
    19 
    20 #include "SDL.h"
    21 
    22 #define NUMTHREADS 10
    23 
    24 static SDL_atomic_t time_for_threads_to_die[NUMTHREADS];
    25 
    26 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
    27 static void
    28 quit(int rc)
    29 {
    30     SDL_Quit();
    31     exit(rc);
    32 }
    33 
    34 int SDLCALL
    35 SubThreadFunc(void *data)
    36 {
    37     while (!*(int volatile *) data) {
    38         ;                       /* SDL_Delay(10); *//* do nothing */
    39     }
    40     return 0;
    41 }
    42 
    43 int SDLCALL
    44 ThreadFunc(void *data)
    45 {
    46     SDL_Thread *sub_threads[NUMTHREADS];
    47     int flags[NUMTHREADS];
    48     int i;
    49     int tid = (int) (uintptr_t) data;
    50 
    51     SDL_Log("Creating Thread %d\n", tid);
    52 
    53     for (i = 0; i < NUMTHREADS; i++) {
    54         char name[64];
    55         SDL_snprintf(name, sizeof (name), "Child%d_%d", tid, i);
    56         flags[i] = 0;
    57         sub_threads[i] = SDL_CreateThread(SubThreadFunc, name, &flags[i]);
    58     }
    59 
    60     SDL_Log("Thread '%d' waiting for signal\n", tid);
    61     while (SDL_AtomicGet(&time_for_threads_to_die[tid]) != 1) {
    62         ;                       /* do nothing */
    63     }
    64 
    65     SDL_Log("Thread '%d' sending signals to subthreads\n", tid);
    66     for (i = 0; i < NUMTHREADS; i++) {
    67         flags[i] = 1;
    68         SDL_WaitThread(sub_threads[i], NULL);
    69     }
    70 
    71     SDL_Log("Thread '%d' exiting!\n", tid);
    72 
    73     return 0;
    74 }
    75 
    76 int
    77 main(int argc, char *argv[])
    78 {
    79     SDL_Thread *threads[NUMTHREADS];
    80     int i;
    81 
    82     /* Enable standard application logging */
    83     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
    84 
    85     /* Load the SDL library */
    86     if (SDL_Init(0) < 0) {
    87         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
    88         return (1);
    89     }
    90 
    91     signal(SIGSEGV, SIG_DFL);
    92     for (i = 0; i < NUMTHREADS; i++) {
    93         char name[64];
    94         SDL_snprintf(name, sizeof (name), "Parent%d", i);
    95         SDL_AtomicSet(&time_for_threads_to_die[i], 0);
    96         threads[i] = SDL_CreateThread(ThreadFunc, name, (void*) (uintptr_t) i);
    97 
    98         if (threads[i] == NULL) {
    99             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread: %s\n", SDL_GetError());
   100             quit(1);
   101         }
   102     }
   103 
   104     for (i = 0; i < NUMTHREADS; i++) {
   105         SDL_AtomicSet(&time_for_threads_to_die[i], 1);
   106     }
   107 
   108     for (i = 0; i < NUMTHREADS; i++) {
   109         SDL_WaitThread(threads[i], NULL);
   110     }
   111     SDL_Quit();
   112     return (0);
   113 }